Sucker-rod for deep wells



(No Model.)

J. M. DAVIDSON.

SUOKER ROD FOR DEEP WELLS.

No. 324,922. I Patented Aug.25, 1885.

24 7 llllmlllll llllll llNrre ATENT FFICE.

JOHN M. DAVIDSON, ()l BRADFORD, PENNSYLVANIA.

SUCKER-ROD FOR. DEEP WELLS.

SPECIFICATION forming part of Letters Patent No. 324,922, dated August25, 1885.

Application filed December 4, 1884. (X0 model.)

To all whmn it may concern.-

Be it known that 1, JOHN M. DAVIDSON, a citizen of the United States,residing at Bradford, in the county of McKean and State ofPennsylvai'lia, have invented certain new and useful Improvements inSucker-Rods for Deep stated, it consists, primarily, in a metalsuckerrod section having a spiral twist throughout its length, andprovided at one end with a threaded pin and at the opposite with athreaded box integral therewith, whereby lightness, together withstiiiiiess or rigidity,is obtained; and, secondarily, in a metallicsucker-rod wherein the spiral twist is lefthanded, or in reversedirection to the coupling-thread of the rod joint, whereby all dangerfrom separation of the sections of the rod is avoided.

l'n pumping deep wells-such as oil-wellsthe suelrerrod extends withinthe tubing down to within a short distance of the standing valve. Inwells of a few hundred feet depth, (which embraces many, if not all, ofthe early oil-wells,) wooden suckerrods were employed, because theessentials of strength, lightness, and cheapness were best obtained bythe use of such material; but when wells began to be bored to fifteenhundred, (1,500,) two thousand (2,000) feet, and deeper, somethingbetter and stronger than the wooden suckerrod was needed, and there is,therefore, a demand for a metal rod.

In order to obtain a very stili" or rigid suckerrod with the leastpossible weight of metal, I give the rod a spiral twist, and I furtherutilizc the spiral twist in the rod as a means oi preventing thedisconnection of the sections, by giving the rods a spiral twist inreverse direction to the thread which couples the sec tions, so that anyfriction against the rod eithcrol'the well-tube or fluid therein willtend to screw up the joints of the rod.

These improvements I have embodied in a sucker-rod, one form of which isshown in the accompany ing drawings, wherein-- Figure 1 represents myimproved meta-l rod in elevation, and Fig. 2 is a cross section of thebody of the rod.

A is the solid enlargement formed on one end of the rod for the supportof the threaded pin a. B is the box, which is interiorly screw threadedto receive the pin of another rod. By means of these boxes and'pins anynumber of these rods can be joined together, forming a string of anydesired length. The rod may be made in any shape or form, and is thentwisted so as to form a spiral. This adds great stiffness to the rod, sothat it can be made of metal of much less weight than would be re quiredif it were not in the form of a spiral.

As shown in the drawings, Fig. 1, the spiral is twisted to the lefthand. This is essential if the threads on the pins and in the boxes arerighthanded, as they always are. If the body or the rod were twistedspirally in the same direction as the thread of the pins, the frictionof the rods against the sides of the tubing would have a tendency tounscrew the joints; but when the twist of the spiral is in the op positedirection to the threads of the pins the tendency is to tighten thejoints. Of course, this would not affect the joints if there were nofriction on the sides of the rods.

I am aware that in the construction of drills a spiral twist has beengiven not only to the bit, but also to the stock, in order to convertthat portion of the bit and stock back of the cutting-edge into aconveyor to conduct away the debris; and I am also aware that twistedlightning-rods of light metal have been provided with screwjoints, insome instances east or riveted to the rod, and in others the sectionsconnected by a detachable couplingnut, which construction lacks thestrength, stability, and non-separable character necessary for useinadeep well. Therefore I do notherein claim such subject-matter.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A section or length for deep-well suckerrods, consisting of aspiraliy-tnised metal the thread of its connections, s bstztntiniiyiis1o rod having at one end a threaded pin and at and for the purposesspecified.

the opposite a threaded box, said pin and box In testimony whereof Iaffix my signature integral with the rod, substantially as and for inpresence of two witnesses; the purposes specified. JOHN M D XYIDSUW 2. Asection or length for deep Well suckerrods, consisting of aspirallytwistcd metal Witnesses: rod provided with threaded connections,the KEN'ION SAULNIER, twist of the rod being in reverse direction from IJAMES C. BOYG E.

